@import '../../var.less';

.vcu-loading {
  position      : relative;
  color         : @loading-spinner-color;
  font-size     : 0;
  vertical-align: middle;

  &__spinner {
    position      : relative;
    display       : inline-block;
    width         : @loading-spinner-size;
    // compatible for 1.x, users may set width or height in root element
    max-width     : 100%;
    height        : @loading-spinner-size;
    max-height    : 100%;
    vertical-align: middle;
    animation     : vcu-rotate @loading-spinner-animation-duration linear infinite;

    &--spinner {
      animation-timing-function: steps(12);
    }

    &--circular {
      animation-duration: 2s;
    }
  }

  &__line {
    position: absolute;
    top     : 0;
    left    : 0;
    width   : 100%;
    height  : 100%;

    &::before {
      display         : block;
      width           : 2px;
      height          : 25%;
      margin          : 0 auto;
      background-color: currentColor;
      border-radius   : 40%;
      content         : ' ';
    }
  }

  &__circular {
    display: block;
    width  : 100%;
    height : 100%;

    circle {
      animation     : vcu-circular 1.5s ease-in-out infinite;
      stroke        : currentColor;
      stroke-width  : 3;
      stroke-linecap: round;
    }
  }

  &__text {
    display       : inline-block;
    margin-left   : @padding-xs;
    color         : @loading-text-color;
    font-size     : @loading-text-font-size;
    vertical-align: middle;
  }

  &--vertical {
    display       : flex;
    flex-direction: column;
    align-items   : center;

    .vcu-loading__text {
      margin: @padding-xs 0 0;
    }
  }
}

@keyframes vcu-circular {
  0% {
    stroke-dasharray : 1, 200;
    stroke-dashoffset: 0;
  }

  50% {
    stroke-dasharray : 90, 150;
    stroke-dashoffset: -40;
  }

  100% {
    stroke-dasharray : 90, 150;
    stroke-dashoffset: -120;
  }
}

.generate-spinner(@n, @i: 1) when (@i =< @n) {
  .vcu-loading__line--@{i} {
    transform: rotate(@i * 30deg);
    opacity: 1 - (0.75 / 12) * (@i - 1);
  }
  .generate-spinner(@n, (@i + 1));
}
.generate-spinner(12);